Microphone coupler for a communication device

ABSTRACT

The invention provides a communication device and a microphone coupler. The device comprises: a microphone; a printed circuit board (PCB) to connect to the microphone; a boot assembly to enclose the microphone and to direct acoustic signals to the microphone; a platform; a housing to enclose the PCB, the microphone, the platform and the boot assembly and to provide an opening to access the microphone; and an acoustic channel connecting the microphone to the opening in the housing. In the device, part of the acoustic channel is formed by a channel formed when the above noted components are assembled together.

FIELD OF INVENTION

The invention relates to a microphone coupler for a communicationdevice. In particular, the invention provides a microphone couplerproviding a conduit allowing a microphone for the device to be placed indifferent locations while maintaining acceptable levels of acousticperformance for the microphone.

BACKGROUND

Many types of electronic communication devices provide voicecommunication capabilities, such as telephones, cellular telephones andwalkie talkies. Generally, such devices have a handset incorporating amicrophone and a speaker. The microphone takes the locally generatedaudible signals (e.g. a user's voice) and the speaker recreates theremotely received audible signals (e.g. the other party's voice).Electronic circuits connected to the microphone convert the locallygenerated audible signals into electronic signals for further processingand transmission by the device. Other electronic circuits provide theelectronic signals embodying the received audible signals to thespeaker. General performance parameters influence the placement of themicrophone and speaker in such devices. For example, the microphoneshould be sufficiently isolated from interference generated from othercomponents, but it still needs to be able to receive the locallygenerated audible signals.

In a typical stationary communication device (such as an officetelephone) its handset is shaped such that the microphone and speakerare in a spaced relationship to each other. When the handset is properlyplaced near a user's face, the speaker is located near an ear of theuser and the microphone is located near the user's mouth. As portabilityis not generally the most critical issue for a stationary device, thehandset can be made large enough such that the microphone, speaker andother components can be mounted at different areas within the handsetand can each operate without unacceptably interfering with each other.

Meanwhile, portable communication devices, such as cellular phones, havesmaller form factors. Locating the microphone and speaker in anappropriate spaced relationship within their form factors is moredifficult, because of the smaller size of the handsets and the increaseddensity of internal components. Further, their antennae generateinterfering signals for some components. As such, suitable locations forthe speaker and microphones in the devices become harder to find.

There is a need for an arrangement which addresses such issues in theprior art.

BRIEF DESCRIPTION OF DRAWINGS

The foregoing and other aspects of the invention will become moreapparent from the following description of specific embodiments thereofand the accompanying drawings which illustrate, by way of example only,the principles of the invention. In the drawings, where like elementsfeature like reference numerals (and wherein individual elements bearunique alphabetical suffixes):

FIG. 1 is a schematic representation of a communication deviceincorporating an embodiment of the invention;

FIG. 2 is a block diagram of internal components of the communicationdevice of FIG. 1, including a microphone and a microphone boot assembly;

FIG. 3 is a schematic representation of an exploded upper perspectiveview of components in a bottom section of the device of FIGS. 1 and 2,including a portion of a lower housing, a portion of a printed circuitboard (PCB), the microphone, the microphone boot assembly, a keypadsupport, a keypad, a microphone gasket and a portion of an upperhousing;

FIG. 4A is a schematic representation of a lower perspective view of thekeypad support of FIG. 3 having the microphone boot assembly insertedtherein;

FIG. 4B is a schematic representation of an upper perspective view ofthe keypad support of FIG. 3 having the microphone gasket mounted inplace;

FIG. 5 is a side cross-section view of the bottom section of thecomponents shown in FIG. 3;

FIG. 6A is a top view of the microphone boot assembly of FIG. 3;

FIG. 6B is a side view of the microphone boot assembly of FIG. 3;

FIG. 6C is a side cross-section view of the microphone boot assembly ofFIG. 3;

FIG. 6D is a bottom view of the microphone boot assembly of FIG. 3;

FIG. 7A is a side view of the gasket of FIG. 3; and

FIG. 7B is a top view of the gasket of FIG. 3.

DETAILED DESCRIPTION OF AN EMBODIMENT

The description which follows and the embodiments described therein areprovided by way of illustration of examples of particular embodiments ofthe principles of the present invention. These examples are provided forthe purposes of explanation and not limitation of those principles andof the invention. In the description which follows, like parts aremarked throughout the specification and the drawings with the samerespective reference numerals.

In a first aspect of an embodiment, a communication device is provided.The device comprises: a microphone; a printed circuit board (PCB) toconnect to the microphone; a boot assembly to enclose the microphone andto direct acoustic signals to the microphone; a platform; a housing toenclose the PCB, the microphone, the platform and the boot assembly andto provide an opening to access the microphone; and an acoustic channelconnecting the microphone to the opening in the housing. In the device,part of the acoustic channel is formed by a channel formed when theabove noted components are assembled together. In particular, that partof the channel is formed when: the boot assembly is mounted over themicrophone; the platform is mounted over the boot assembly; and thehousing is assembled to enclose the PCB.

In the device, the platform may comprise an aperture therein; part ofthe acoustic channel may be connected to a bottom side of the aperture;and the acoustic channel also may comprise a gasket having an internalconduit. The gasket may be mounted at one end to a top side of theaperture and at another end to an opening in the housing.

In the device, the platform may further comprises a frame shaped to holdthe assembly underneath the frame.

In the device, the opening in the housing may be located in a lower endof the housing.

In the device, the microphone may be mounted on the PCB with itsaperture facing upward from the PCB.

In the device, the boot assembly may comprise: a coupling section shapedto hold the microphone with its aperture facing upward from the PCB; abeam extending outwardly from the coupling section; a wall extendingabove a perimeter of the beam, forming a channel within the wall andabove the beam and with an air gap above the aperture of the microphoneand the volume.

In the device, the conduit may form a first 90 degree turn from themicrophone and a second 90 turn to the aperture in the support.

In the device, an acoustic mesh may be provided in the acoustic channel.

In the device, digital signal processing may be provided to adjustsignals generated by the microphone to accommodate for acousticcharacteristics of the acoustic channel.

In the device, a keypad may be mounted on a top surface of the platform.

In the device, the coupling section may comprise a lateral rib extendingaround its exterior to mate with an interior surface of the frame of theplatform.

In a second aspect, a microphone coupler for a microphone in acommunication device is provided. The coupler comprises: a couplingsection shaped to hold the microphone with its aperture facing upwardfrom the PCB; a beam extending outwardly from the coupling section; awall extending above a perimeter of the beam, forming a channel withinthe wall and above the beam and with an air gap above the aperture ofthe microphone.

The coupler may be shaped to mate with a platform to hold the couplerunderneath the platform and to seal against a bottom side of theplatform to seal the conduit.

In the coupler, the conduit may form a first 90 degree turn from themicrophone and a second 90 turn to the aperture in the platform.

In other aspects various combinations of sets and subsets of the aboveaspects are provided.

FIG. 1 schematically illustrates a handheld mobile communication device10 and its components, including a housing 12, input devices (e.g.keyboard 14A or thumbwheel 14B) and display 16, which is preferably agraphic Liquid Crystal Display (LCD), although other types of outputdevices may alternatively be utilized. Typically, housing 12 is amoulded polycarbonate structure and may be formed via known plasticforming techniques. To assist in assembly of device 10, housing 12typically comprises two or more pieces which mate together in a fittedarrangement to enclose the internal components and form an exteriorcasing for device 10. For example, housing 12 may comprise an upperhousing (12A) and a lower housing (12B) which fit together. Physicallyfor device 10, housing 12 may be elongated vertically, or may take onother sizes and shapes (including clamshell cover structures). Device 10has a speaker 18 and microphone 20 (each is shown in dashed outline aseach is contained within device 10) which are connected and controlledby electronic circuits (not shown) and software within device 10. Thesecomponents provide an audible communication interface for voicecommunications processed by device 10, such as a telephone call. Housing12A has a series of openings in it providing access to componentslocated inside device 10. Opening 22 is located in an upper region ofdevice 10 and provides a connection to speaker 18, allowing soundgenerated by speaker 18 to be emitted from within device 10. Opening 24is located in a lower region in device 10 and provides an access channelfor sounds generated by the user to enter device 10 which aresubsequently directed towards microphone 20. Opening 26 provides anaperture for keypad 14A to protrude from within device 10 to have itskeys extending above the front surface of device 10.

Referring to FIG. 2, operating components of device 10 are shown. Acentral data processing element in device 10 is microprocessor 28, whichis shown as being coupled between keyboard 14A, thumbwheel 14B, display16, speaker 18 and microphone 20 and a series of other internal devices.For the purposes of the description, the term keypad and keyboard refersto both the exterior mechanical exposed key elements and the underlyingswitch and activation elements (e.g. elastomers, domes and contactregions). Microprocessor 28 controls the operation of the display 16, aswell as the overall operation of the device 10, in response to actuationof keys on the keyboard 14A or thumbwheel 14B by a user. Exemplarymicroprocessors which may be used for microprocessor 28 include Data 950(trade-mark) series microprocessors and the 6200 series microprocessor,both available from Intel Corporation.

In addition to the microprocessor 28, other internal components of thedevice 10 are shown. These devices include: a communication subsystem30, a short-range communication subsystem 32, a set of auxiliary I/Odevices 34 and a serial port 36. Memory for device 10 is provided inflash memory 38 and random access memory (RAM) 40. Internal devices areenclosed within housing 12 and typically are either mounted onto aprinted circuit board (PCB), affixed to an interior part of the cover orsuspended by some means within housing 12.

The device 10 is preferably a two-way radio frequency (RF) communicationdevice having voice and data communication capabilities. In addition,device 10 preferably has the capability to communicate with othercomputer systems via the Internet.

Operating system software executed by the microprocessor 28 ispreferably stored in a computer readable medium, such as flash memory38, but may be stored in other types of memory devices, such as readonly memory (ROM) or similar storage element. In addition, systemsoftware, specific device applications, or parts thereof, may betemporarily loaded into a volatile store, such as RAM 40. Communicationsignals received by the mobile device may also be stored to RAM 40.

Microprocessor 28, in addition to its operating system functions,enables execution of software applications on device 10. A set ofsoftware applications that control basic device operations, such as avoice communication module 42A and a data communication module 42B, maybe installed on the device 10 during manufacture or downloadedthereafter. Cell mapping module 42C may also be installed on device 10during manufacture. As well, additional software modules, illustrated asan other software module 42D, which may be, for instance, a personalinformation manager (PIM) application, may be installed duringmanufacture or downloaded thereafter into device 10. PIM application ispreferably capable of organizing and managing data items, such as e-mailmessages, calendar events, voice mail messages, appointments, and taskitems. PIM application is also preferably capable of sending andreceiving data items via a wireless network 44.

Communication functions, including data and voice communications, areperformed through the communication subsystem 30, and possibly throughthe short-range communication subsystem 32. Communication subsystem 30includes receiver 46, transmitter 48 and one or more antennae,illustrated as receive antenna 50 and transmit antenna 52 (which aretypically combined into a single antenna). In addition, communicationsubsystem 30 also includes processing module, such as digital signalprocessor (DSP) 54 and local oscillators (LOs) 56. The specific designand implementation of communication subsystem 30 is dependent upon thecommunication network in which device 10 is intended to operate. Forexample, communication subsystem 30 of the device 10 may be designed tooperate with the Mobitex (trade-mark), DataTAC (trade-mark) or GeneralPacket Radio Service (GPRS) mobile data communication networks and alsodesigned to operate with any of a variety of voice communicationnetworks, such as Advanced Mobile Phone Service (AMPS), Time DivisionMultiple Access (TDMA), Code Division Multiple Access CDMA, PersonalCommunication Service (PCS), Global System for Mobile Communication(GSM), etc. Other types of data and voice networks, both separate andintegrated, may also be utilized with device 10. It will be appreciatedthat some signals received and transmitted through the subsystem 30 mayprovide interfering signals with other components in device 10, such asmicrophone 20.

Network access requirements vary depending upon the type ofcommunication system which can communicate with device 10. For example,in the Mobitex (trade-mark) and DataTAC (trade-mark) networks, mobiledevices are registered on the network using a unique PersonalIdentification Number (PIN) associated with each device. In GPRSnetworks, however, network access is associated with a subscriber oruser of a device. A GPRS device therefore requires a subscriber identitymodule, commonly referred to as a Subscriber Identity Module (SIM) card,in order to operate on a GPRS network.

When required network registration or activation procedures have beencompleted, device 10 may send and receive communication signals overcommunication network 44. Signals received from communication network 44by the receive antenna 50 are routed to receiver 46, which provides forsignal amplification, frequency down conversion, filtering, channelselection, etc., and may also provide analog to digital conversion.Analog-to-digital conversion of received signals allows the DSP 54 toperform more complex communication functions, such as signaldemodulation and decoding. In a similar manner, signals to betransmitted to network 44 are processed (e.g., modulated and encoded) byDSP 54 and are then provided to transmitter 48 for digital to analogconversion, frequency up conversion, filtering, amplification andtransmission to communication network 44 (or networks) via the transmitantenna 46.

In addition to processing communication signals, DSP 54 provides forcontrol of receiver 46 and transmitter 48. For example, gains applied tocommunication signals in receiver 46 and transmitter 48 may beadaptively controlled through automatic gain control algorithmsimplemented in DSP 54.

In a data communication mode, a received signal, such as a text messageor web page download, is processed by the communication subsystem 30 andis provided to microprocessor 28. The received signal is then furtherprocessed by microprocessor 28 for an output to the display 16, oralternatively to some other auxiliary I/O devices 34. A device user mayalso compose data items, such as e-mail messages, using keypad 14A,thumb-wheel 14B and/or some other auxiliary I/O device 34, such as atouchpad, a rocker switch or some other type of input device. Thecomposed data items may then be transmitted over communication network44 via communication subsystem 30.

In a voice communication mode, overall operation of device 10 issubstantially similar to the data communication mode, except thatreceived signals are output to speaker 18, and received audio signalsare provided to microphone 20 for conversion into an electrical signaland processing by device 10. Microphone 20 is preferably an electretcondenser microphone (ECM), but any type of microphone may be used whichcan be mounted to PCB 104 (shown in FIG. 3), including a silicon-basedtransducer. Microphone boot assembly 100 is coupled to microphone 20 andprovides part of an acoustic channel to direct voice signals receivedfrom the outside of device 10 at opening 24 to microphone 20.

Short-range communication subsystem 32 enables communication betweendevice 10 and other proximate systems or devices, which need notnecessarily be similar devices. For example, the short-rangecommunication subsystem may include an infrared device and associatedcircuits and components, or a Bluetooth (trade-mark) communicationmodule to provide for communication with similarly-enabled systems anddevices.

Clock circuit 58 provides a regular clocking signal for microprocessor28 and its signal can be used by other components in device 10.

Powering the entire electronics of the mobile handheld communicationdevice is power source 60. Preferably, the power source 60 includes oneor more batteries. More preferably, the power source 60 is a singlebattery pack, especially a rechargeable battery pack. A power switch(not shown) provides a separate on/off switch for device 10.

FIGS. 3, 4A, 4B and 5 provide further detail on aspects of housing 12and internal components of device 10. For the purposes of illustration,references to front side, back side, left side, right side, and top andbottom ends are provided using the orientation markings relative to theside view of device 10 as shown in FIG. 5. Therein, the front side ofthe PCB is the front facing side having display 16 mounted thereto. Itwill be appreciated that the term “top” may be used interchangeablelythe “front” side and the “top” end of device 10 and similarly that theterm “bottom” may be used interchangeablely the “back” side and the“bottom” end of device 10. The relative positions will be clear in thecontext of the use of the terms. These references provide relativepositional references for components for convenience only and are notmeant to be limiting, unless otherwise noted.

PCB 104 provides a substrate for mounting and supporting the internalcomponents on both of its top and bottom sides and provides someelectrical circuitry for the devices, as defined by etchings within thelayers of plastic and copper. As such, components can be more denselypacked thereon, thereby reducing the size of PCB 104. PCB 104 issecurely mountable within housing 12, typically via screws. PCB 104 is agenerally planar sandwich of layers of plastic (or FR4) and copper.Microphone 20 is mounted to PCB 104 and makes electrical contact withterminals provided therein. Microphone 20 is shown as anupright-oriented cylinder casing having an aperture on its top allowingambient sound signals to be received there through and to be convertedinto an electrical signal. Typically, there are at least two electricalcontacts for microphone 20 which are generally located on its bottomside of its casing. Corresponding contact pads are located on PCB 104 toseparately engage the contacts and complete an electrical circuit towhich can be used by other elements within device 10. In otherembodiments, microphone 20 may have an oblong-shaped case.

Certain physical and operational restrictions may affect the location ofcomponents on PCB 104 and to their placement on a particular sidethereof. For example, a conventional industrial exterior design ofdevice 10 has keypads on its top surface, thereby requiring that theelectrical components relating to the keypad 14A be placed on the topside of PCB 104. Similarly, microphone 20 can be sensitive tointerference signals from antennae 50 and/or 52. As such, it ispreferable to locate microphone 20 as far away as possible from antennae50 and 52. In one design layout, at least one of antennae 50 and 52 islocated on the bottom of PCB 104 in the bottom part of device 10. Toassist in isolating microphone 20 from interference from such antennae50 and/or antenna 52, microphone 20 is located as far away as possiblefrom such antennae.

Further detail on interior and exterior components of device 10 are nowprovided. In a bottom section of device 10, keypad 14A and microphone 20are located. In order to have the keys of keypad 14A protruding throughthe front surface of housing 12A through opening 26, keypad supportplatform 102 is provided as a frame on which keypad 14A is mounted.Platform 102 is mated to PCB 104, thereby raising keypad 14A up to andthrough opening 26. Platform 102 is an oblong-shaped component having aflat base 142 mounted on an exterior frame 114. Base 142 is shaped tofit over the bottom portion of PCB 104. Frame 114 is a shaped wall whichwinds generally around the perimeter of base 142. An internal cavity 112is formed within frame 114 and under base 142.

Keypad 14A can be mounted on keypad support platform 102 via a frictionfit arrangement, screws, tabs and slot arrangements, double sided tape,welds, solder or other means. Keypad support platform 102 can beattached to PCB 104 using similar means. In particular, side latches 120extending downward from platform 102 provide a snap-fit engagement withthe sides of PCB 104 to hold platform 102 on top of PCB 104. Screw holes122 allow screws to be inserted there through to further secure platform102 to PCB 104.

When platform 102 is mounted onto PCB 104, cavity 112 is formed betweenPCB 104 and base 142. Different sized cavities can be provided byproviding different shapes and sizes for platform 102. Cavity 112 allowscomponents to be placed underneath platform 102 on PCB 104.

Taking advantage of the additional space for components provided bycavity 114, device 10 locates microphone 20 therein. Preferably thelocation of microphone 20 is set such that it is physically far enoughaway from other components which may interfere with the operation ofmicrophone 20. It is also located such that its aperture faces upward,in a common orientation for voice communication devices. In particular,preferably microphone 20 is sufficiently far from antennae 50 and 52.More preferably, the location of microphone 20 is sufficiently far fromother potentially interfering components so as to reduce or eliminatethe need to provide radio frequency (RF) shielding through a separateshield for microphone 20. In some situation, however, it may still bebeneficial to provide separate RF shielding for microphone 20.

With microphone 20 being located within cavity 114, it is also isolatedfrom opening 24 in housing 12A. In order to channel audible signalsreceived at opening 24 to microphone 20, the embodiment provides anacoustic channel to acoustically connect opening 24 to microphone 20.The acoustic channel generally follows a path as shown by arrow 110.Briefly, a series of components having conduits are linked together todefine the acoustic channel. Each component is described in turn.

From opening 24, the acoustic channel comprises gasket 106, aperture 108in platform 102 and boot assembly 100. Gasket 106 is a pliable uprighttube which has its top opening mated to opening 24 and its bottomopening mated to aperture 108. Gasket 106 may be made from urethanefoam. The bottom end of gasket 106 is preferably fixed to keypad supportplatform 102 with double-sided tape. Aperture 108 provides a verticalhole in platform 102. Opening 24, gasket 106 and aperture 108 arepreferably aligned in a vertical column. However, different shapes andarrangements can be provided such that opening 24 and aperture 108 arenot aligned directly to each other and that gasket 106 is shaped tostill mate with both elements and provide part of the acoustic channelthere between. When housings 12A and 12B are mated together, gasket 106may compress between opening 24 and platform 102.

In the embodiment, aperture 108 is located at a bottom portion ofplatform 102. Microphone 20 is located in underneath a middle portion ofplatform 102. As such, to complete the acoustic channel, microphone bootassembly 100 provides a channel between the bottom side of keypadsupport platform 102 about aperture 108 to microphone 20. The bootassembly 100 carries the acoustic signal from the lower opening ofaperture 108 in the bottom portion of platform 102 to the middle portionof platform 102.

Microphone boot assembly 100 is a generally columnar-shaped device whichlies laterally on PCB 104 underneath platform 102. At one end,microphone boot assembly 100 encapsulates microphone 20 such that itsaperture is exposed to an internal channel 126 running along its length.An end of channel 126 also connects to aperture 108, when boot assembly100 is properly installed. The interior channel 126 is formed by thewalls of boot assembly 100 and the bottom surface of platform 102. Bootassembly 100 provides a housing, as a microphone coupler, for microphone20 as well as a portion of the acoustic channel.

Referring to FIG. 4A, microphone boot assembly 100 is held withinplatform 102 via a shaped portion of frame 114, noted as 1 14A, whichpreferably is shaped to provide a close friction fit for the exteriorform of microphone boot assembly 100, allowing boot assembly 100 to beheld within the shaped portion of frame 114 to reduce or eliminate theneed for the use of adhesives or other binding technologies.

Referring to FIGS. 6A-6D, further detail on boot assembly 100 is shown.Generally boot assembly 100 comprises an elongated lateral section 130and a microphone coupling section 132 located at one end of section 130.Coupling section 132 is an upright cylindrical section open at both endshaving interior volume 134 preferably shaped to fit snugly around theexterior sides of microphone 20 allowing a positive and secure insertionof microphone 20 in volume 134. Further the shape of interior volume 134allows the contacts on the bottom of microphone 20 to be exposed to andmake connection with corresponding contact pads on PCB 104 for themicrophone. Coupling section 132 is shaped to have a height such thatthe interior volume 134 has a gap 136 above microphone 20 to allowaudible signals to be carried from lateral section 130 to volume 134 andto the aperture of microphone 20. It will be appreciated that microphone20 may be inserted into volume 134 and may be snugly held therein,allowing microphone body 100 and microphone to be inserted as onecombined component during the assembly process of device 10.

Elongated section 130 is generally comprised of a horizontally extendingbeam 138 projecting outward from coupling section 132, below gap 136. Onthe top surface of beam 138 is wall 140 which runs along the exteriorperimeter of section 132. The height of wall 140 extends from the bottomof coupling section 132 to the top of coupling section 132. As such,interior channel 126 is formed above beam 138. When microphone 20, bootassembly 100 and support 102 are assembled and mounted on PCB 104, atthe anterior end of beam 138, channel 126 is in communication withaperture 108 on keypad support platform 102 and at the other end of beam138, channel 126 is in communication with gap 136, thereby forming achannel for the last section of the acoustic channel. To complete thelast section of the acoustic channel, when boot assembly 100 is insertedinto frame section 114A, the top surface of boot assembly 100 is pressedflush against the bottom surface of platform 102. As such, the bottomsurface of platform 102 forms a cover for channel 126. As walls 1 14Aare shaped to enclose boot assembly 100 against platform 102, the walls1 14A assist in sealing the interface between boot assembly 100 andplatform 102. To assist in retaining boot assembly 100 within section 114A, outwardly extending features may be provided on the lateralexterior surfaces of boot assembly 100 which provide points of frictionbetween assembly 100 and sections 114A. For example, lateral ridges 128may be provided on the exterior of section 132.

Boot assembly 100 is made of a rubber-like, flexible material and ispliable allowing it to snugly fit around microphone 20. In otherembodiments, selected surfaces of boot assembly 100 may be metallized toprovide RF shielding for microphone 20. If surfaces were metallized, itwould be preferable that such surfaces do not significantly compromisethe performance of other components, such as antennae 50 and/or 52.

It will be appreciated that the acoustic channel may have some effect onthe acoustic frequency response of the audible signals as they windthrough the channel from the opening 24 to microphone 20. Generally, thechannel provides a relatively straight vertical section descending fromopening 24 then a 90 degree turn through interior volume 126 and another90 degree turn to the aperture of microphone 20. In most instances, thetwo 90 degree turns do not have a significant impact on the acoustics.It will be appreciated that the overall length of the acoustic channel,including the two 90 degree turns, may create undesirable resonances inthe frequency range of interest. Signal shaping may be provided toaddress such resonances. If signal shaping is required, an acoustic meshcan be inserted in the acoustic channel to act as a damper for targeted(generally high) frequencies in the signals. The mesh can be of anymaterial known in the art and can be inserted in any appropriatelocation in the acoustic channel. However, a more effective location forthe mesh is to have it placed as close as possible to opening 24. In oneembodiment, a layer of acoustic mesh 144 can be placed between gasket106 and platform 102. A layer of double-sided tape can be used to attachmesh 144 to the bottom of gasket 106 and another layer of double-sidedtape can be used to secure the bottom side of the mesh to platform 102.In other embodiment, signal shaping through DSP processing of theelectronic signals produced by microphone 20 may be provided to addressany signal shaping requirements. For example, the DSP processing mayattempt to fit the signals within certain operating masks for certaincommunication standards, such as the known GSM mask.

In one embodiment, the length of volume 126 to the center of volume 134is approximately 15 mm; the height is approximately 0.5 mm; and thewidth is approximately 2.7 mm. Other dimensions for other applicationsmay be used.

In other embodiments, a fully enclosed shaped tube may be used toconnect the bottom opening of aperture 108 to microphone 20.

In other embodiments, the acoustic channel may be routed downward fromopening 24 and pass beside platform 102. Therein, boot assembly 100 mayextend from underneath platform 102 and have an elbow conduit risingupwards to meet opening 24. In such an embodiment, gasket 106 may not berequired. However, an acoustic mesh may still be used.

Although the invention has been described with reference to certainspecific embodiments, various modifications thereof will be apparent tothose skilled in the art without departing from the scope of theinvention as outlined in the claims appended hereto.

1. A communication device, comprising: a microphone; a printed circuitboard (PCB) to connect to said microphone; a boot assembly to enclosesaid microphone and to direct acoustic signals to said microphone; aplatform; a housing to enclose said PCB, said microphone, said platformand said boot assembly, said housing providing an opening to access saidmicrophone; and an acoustic channel to connect said microphone to saidopening in said housing, wherein part of said acoustic channel is formedby a channel formed by said boot assembly and a bottom surface of saidplatform when said boot assembly is mounted over said microphone; saidplatform is mounted over said boot assembly; and said housing isassembled to enclose said PCB.
 2. The communication device as claimed inclaim 1, wherein: said platform comprises an aperture therein, said partof said acoustic channel connects to a bottom side of said aperture;said acoustic channel also comprises a gasket having an internalconduit, said gasket mounted at one end to a top side of said apertureand at another end to said opening.
 3. The communication device asclaimed in claim 2, wherein: said platform further comprises a frameshaped to hold said assembly underneath said platform.
 4. Thecommunication device as claimed in claim 3, wherein: said opening insaid housing is located in a lower end of said housing.
 5. Thecommunication device as claimed in claim 4, wherein: said microphone ismounted on said PCB with an aperture of said microphone facing upwardfrom said PCB.
 6. The communication device as claimed in claim 5,wherein: said boot assembly comprises a coupling section shaped to holdsaid microphone with said aperture facing upward from said PCB; a beamextending outwardly from said coupling section; a wall extending above aperimeter of said beam, forming said channel within said wall and abovesaid beam and with an air gap above said aperture of said microphone. 7.The communication device as claimed in claim 6, wherein said channelforms a first 90 degree turn from said microphone and a second 90 turnto said aperture in said support.
 8. The communication device as claimedin claim 6, wherein an acoustic mesh is provided in said acousticchannel.
 9. The communication device as claimed in claim 6, whereindigital signal processing is provided to adjust signals generated bysaid microphone to accommodate for acoustic characteristics of saidacoustic channel.
 10. The communication device as claimed in claim 6,wherein said coupling section comprises a lateral rib extending aroundits exterior to mate with an interior surface of said frame of saidplatform.
 11. The communication device as claimed in claim 6, wherein akeypad is mounted on a top surface of said platform.
 12. A microphonecoupler for a microphone in a communication device, comprising: acoupling section shaped to hold said microphone with said aperturefacing upward from said PCB; a beam extending outwardly from saidcoupling section; a wall extending above a perimeter of said beam,forming a channel within said wall and above said beam and with an airgap above said aperture of said microphone and said volume.
 13. Themicrophone coupler as claimed in claim 12, wherein said conduit forms afirst 90 a degree turn from said microphone and a second 90 turn to saidaperture in said platform.
 14. The microphone coupler as claimed inclaim 13, wherein said coupler is shaped to mate with a platform to holdsaid coupler underneath said frame and to seal against a bottom side ofsaid platform to seal said channel.